Lexer: /lek'sr/ N. Common Hacker Shorthand For `lexical Analyzer', The Input-tokenizing Stage In The Parser For A Language (the Part That Breaks It Into Word-like Pieces).

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:lexer: /lek'sr/ n. Common hacker shorthand for `lexical
analyzer', the input-tokenizing stage in the parser for a language
(the part that breaks it into word-like pieces). "Some C lexers
get confused by the old-style compound ops like `=-'."
-- The AI Hackers Dictionary

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